CN1864363A - Medium access control priority-based scheduling for data units in a data flow - Google Patents
Medium access control priority-based scheduling for data units in a data flow Download PDFInfo
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- CN1864363A CN1864363A CNA2004800294940A CN200480029494A CN1864363A CN 1864363 A CN1864363 A CN 1864363A CN A2004800294940 A CNA2004800294940 A CN A2004800294940A CN 200480029494 A CN200480029494 A CN 200480029494A CN 1864363 A CN1864363 A CN 1864363A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1867—Arrangements specially adapted for the transmitter end
- H04L1/1874—Buffer management
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1867—Arrangements specially adapted for the transmitter end
- H04L1/1887—Scheduling and prioritising arrangements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/56—Allocation or scheduling criteria for wireless resources based on priority criteria
- H04W72/566—Allocation or scheduling criteria for wireless resources based on priority criteria of the information or information source or recipient
- H04W72/569—Allocation or scheduling criteria for wireless resources based on priority criteria of the information or information source or recipient of the traffic information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
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Abstract
A data communication having at least one data flow is established over a wireless interface between a radio network and a user equipment node (UE). A medium access control (MAC) layer located in a radio network node receives data units from a higher radio link control (RLC) layer located in another radio network node. Some or all of a header of a RLC data units associated with the one data flow is analyzed at the MAC layer. Based on that analysis, the MAC layer determines a priority of the data unit relative to other data units associated with the one data flow. The MAC layer schedules transmission of higher priority data units associated with the one data flow before lower priority data units associated with the one data flow. The priority determination does not require extra priority flags or signaling.
Description
Technical field
The present invention relates to wireless communication system, particularly the block transmission dispatching of the high speed downlink packet of operation access (HSDPA) in Universal Mobile Telecommunications System (UMTS) land radio access web (UTRAN).
Background technology
Universal Mobile Telecommunications System (UMTS) is the 3-G (Generation Three mobile communication system) by global system for mobile communications (GSM) development, and plans to provide the improvement mobile communication business based on GSM core net (CN) and Wideband Code Division Multiple Access (WCDMA) (WCDMA) access technology.Fig. 1 has shown the UMTS Terrestrial radio access network (UTRAN) that defines among the 3G (Third Generation) Moblie standard 3GPP.
As shown in Figure 1, UTRAN 110 comprises one or more wireless network subsystems (RNS) 120 and 130.Each RNS 120,130 comprises radio network controller (RNC) 121,131 and one or more B node 122,123,132,133 (the B node is similar to radio base station).For example, B node 122 is managed by RNC 121, and receives the information of launching via uplink channel from the physical layer of subscriber equipment (UE) 150 (being called portable terminal sometimes), and launches data via downlink channel to UE 150.According to the viewpoint of UE, the B node serves as the access point of UTRAN.RNC 121 and 131 distributes and manages the radio resource of UMTS, and connects suitable core net according to offering user business type.For example, RNC121 is connected the mobile switching centre (NSC) that is used for circuit-switched communications such as voice call service with 131, with the Serving GPRS Support Node that is used to be connected packet switching communication such as wireless internet service (SGNC) 142.Being responsible for directly, the RNC of management B node is known as control RNC (CRNC).CRNC manages common radio resources.On the other hand, the RNC of the dedicated radio resources of management particular UE is known as Serving RNC (SRNC).CRNC can be arranged in identical physical node jointly with SRNC.Yet if UE moves to the zone of the new RNC that is different from SRNC, CRNC can be positioned at the different place of physics with SRNC.
UMTS comprises as the communication path interface operable between the heterogeneous networks unit.For example, the interface between B node and the RNC is known as Iub interface, and the interface between the RNC is known as the Iur interface.Interface between RNC and the core net is known as the Iu interface.
Because wireless internet service becomes welcome, different business needs more high data rate and more high power capacity.Although UMTS has been designed to support the multi-media radio business, peak data rate is not enough to satisfy desired quality of service.Therefore, 3GPP is implementing at the research that enhanced data rates and wireless capacity are provided.A result of this research is that high speed downlink packet inserts (HSDPA).The purpose of HSDPA system provides the maximum data rate of 10Mbps, and improves the wireless capacity in descending.
Various technology among the HSDPA comprise link circuit self-adapting (LA) and mixed automatic repeat request (HARQ).In the LA method, UTRAN can select suitable modulation and encoding scheme (MCS) according to channel condition.For example, if channel condition is good, then LA uses 16 quadrature amplitude modulation (qam)s to increase throughput.If but channel condition is bad, then LA uses Quadrature Phase Shift Keying (QPSK) to increase the probability of success.
The grouping of HARQ method retransmits lost, but accurately operate the repeating method that is different from the rlc layer.If a grouping is destroyed during the transmission, then HARQ sends another grouping that comprises the additional information that is used to recover.The branch combination original packet that retransmits merges in receiver.Retransmission packet can comprise with in the identical information of the data of preceding transmission, perhaps can comprise and be used for any additional supplementary information that data are recovered.
Because the HSDPA system is the evolutional form of UMTS system, so the UNTS network need keep as much as possible, to support downward compatibility and to reduce the cost of network configuration.In order to reduce the influence of change, in the B node, support most of HSDPA features, so will not influence the other parts of UMTS network.Therefore, some function in the Node B needs to change, and shifts some MAC function from RNC.The MAC function constitutes new media access control sublayer in the B node, and is known as " MAC-hs " sublayer.The MAC-hs sublayer is positioned on the physical layer, and carries out packet scheduling and various other function (comprising HARQ and LA).In addition, the management of MAC-hs sublayer is referred to as HSDPA downlink sharied signal channel (HS-DSCH) transmission channel, and this channel is used for data are delivered to physical layer from the MAC-hs sublayer.
Fig. 2 has shown the protocol architecture of the Radio interface protocols that defines among the 3GPP.Radio interface protocols flatly comprises physical layer, data link layer and network layer, and vertically is divided into chain of command that is used for control information (signaling) transmission and the user's face that is used for data information transfer.User's face is the zone of transmission user business such as voice messaging or IP (Internet protocol) grouping, and chain of command is the zone of the required control information of transmission network maintenance and management.
The MAC layer is divided into MAC-d sublayer 222 and MAC-hs sublayer 224.MAC-d carries out the sublayer one group of function, comprises that (1) is mapped to public and dedicated transmission channel to logic channel, and (2) are multiplexed into one or more logic channels on the transmission channel (C/T MUX), (3) encrypt/decrypt or the like.MAC-d sublayer 222 offers the MAC-hs sublayer 224 that further describes below to data flow, and each data flow is associated with certain scheduling attribute.The MAC layer is launched data by use suitably mapping between logic channel and transmission channel.MAC-d sublayer management dedicated transmission channel, and MAC-c/sh sublayer management common transport channels.The MAC-d sublayer is positioned among the SRNC, and the MAC-c/sh sublayer is positioned among the CRNC.
The reliable transmission of Radio Link control (RLC) the responsible rlc protocol data cell of layer (PDU).RLC can segmentation or the RLC Service Data Unit (SDU) that transmits from higher level of cascade.If RLC PDU is ready to, then they is passed to the MAC layer and send other node (UE or UTRAN) in regular turn to.Sometimes, may lose RLC PDU during the transmission.In this case, the PDU that loses can be retransmitted.The functions of retransmission of rlc layer is known as automatic repetitive requests (ARQ).
Rlc layer can comprise some RLC entities.Each RLC entity is carried out independently Radio Link controlled function.The operator scheme of each RLC entity is one of transparent mode (TM), unacknowledged mode (UM) and affirmation mode (AM), and this depends on used function.In rlc layer, data are treated to and belong to logic channel.There are the various types of logic channels that depend on what information type of channel bearing.Logic channel can be divided into two channels.A logic channel is the control channel that is used for the chain of command message transmission, and another is the Traffic Channel that is used for the user plane information transmission.
Packet data convergence protocol (PDCP) layer is positioned on the rlc layer, and the data of effective transport network protocols such as IPv4 or IPv6.For example, can use the header compression method that reduces packet header information.The PDCP layer can comprise some independent PDCP entities such as rlc layer.Broadcast/multi broadcast control (BMC) layer is responsible for sending the broadcast from being positioned at the CBC (CBS) of core net.The major function of BMC is scheduling and transmits the cell broadcast messages of going to UE.The BMC layer uses the RLC entity with the unacknowledged mode operation usually, so that transmit broadcast.Radio Resource control (RRC) layer is the layer that defines in the chain of command.RRC carries out foundation, reconstruction and the release function of Radio Resource.In addition, rrc layer can use the control information of RRC message at UE between UTRAN.
Fig. 3 has shown the Radio interface protocols that is used for the HSDPA system.The MAC-hs sublayer is set on the physical layer (PHY) of B node.In UE and UTRAN, the MAC-hs sublayer sends data to upper strata via MAC-c/sh and MAC-d sublayer.MAC-c/sh and MAC-d sublayer are arranged in CRNC and SRNC.HS-DSCH Frame Protocol (FP) transmits the HSDPA data on Iub or Iur interface.
Radio Link control (RLC) usually with the affirmation mode operation, retransmits so that carry out between radio network controller (RNC) and subscriber equipment (UE) when using with HS-DSCH.Between Node B and UE, also carry out other re-transmission of MAC-hs level that is used for downlink data traffic.Because a large amount of user of B node service, perhaps the data that reach the particular UE that is used for the certain priority data flow need can send this UE to until these data at B node buffer memory.If using, UE has some wireless stream of data of different priorities, if the higher priority data transmission is feasible, and then may buffer memory remarkable period of lower-priority data.
Because scheduling decision is to make on the B node in HSDPA, so the B node is data cached before transmission.Can consult the data in buffer amount with the RNC that uses credit scheme (credit scheme).Certainly, there be some delay related with this negotiations process.The B node must send capacity allocation message (this message need be handled by RNC) and associated data to be transmitted.This negotiation delay is known as " credit two-way time " (cRTT).
At any time, the B node need be for the enough data of each UE data flow storage, to satisfy contingent all transmission during this cRTT.Although enough data that it can all data flow of buffer memory, to be used for all data flow of all UE of sub-district, perhaps this cause suboptimum scheduling decision, and this decision is instigated by availability of data rather than by channel condition.If there is sufficient memory, and if B node branch be used in the enough credit of all data of the first-class marquis of RNC, then realize better airborne performance.Affirmation mode (AM) RLC relies on and retransmits the residual frame error rate that realizes expection.Re-transmission is to trigger by the feedback information that sends about every frame state.Avoid the required buffer memory of " stall " (that is, transmit and retransmission buffer takes and can not accept more multidata) proportional and proportional with re-transmission two-way time (rRTT) with aerial throughput.The time of rRTT between when receiver detects " hole " in the grouping serial number and when retransmission packet the time.People wish to reduce rRTT to reduce RLC cache size, perhaps improve the RLC performance that equates the RLC buffer size.
In the B node and the type of the RLC grouping that sends of the Frame Protocol that uses between the HS-DSCH among the RNC (FP) nonrecognition, i.e. nonrecognition grouping is grouping that transmits for the first time or the grouping that retransmits.This means that except status report transmissions postpones, rRTT also will comprise the buffer delay on the B node.The data volume that is provided with in the B nodal cache device is big more, and rRTT is just big more.
Buffer delay influences RLC re-transmission two-way time (rRTT) and aspect delay and the throughput RLC is being caused harmful effect in the B node.By in individual traffic, introducing the dissimilar different priorities that is used for RLC Packet Data Unit (PDU), can reduce rRTT.For example, " state " PDU promptly sends the ARQ feedback information of UE in the down link direction, have high priority.For uplink service,, improve performance by quick transmission RLC status PDU as reality is in the B node.As another example, " re-transmission " PDU is given the priority that is higher than the PDU that transmits for the first time.For downlink traffic, retransmit the priority that PDU is higher than the PDU that transmits for the first time, allow of the faster transmission of UE data to higher protocol level.Because AM RLC uses in order and transmits, therefore according to from its same sequence Data transmission of RNC RLC entity transmission.If RLC PDU loses, then buffer memory has all PDU of higher sequence number, is received until the PDU that loses.Therefore, the PDU that loses causes the delay of all follow-up datas.By really the PDU that loses promptly being retransmitted prioritization, improve performance.
Summary of the invention
The levels of priority of dissimilar RLC PDU can be sent via Iub interface in data flow, as the part of Frame Protocol.For example, 2 bit fields of the priority of expression PDU can send between RNC and B node.But the additional signaling that this scheme need be from RNC to the B node.Extra signaling is by avoiding according to the B node of the automatic content classification RLC PDU in the RLC PDU header.Even the B node does not comprise any RLC " understanding " usually, but if desired, then in the B node, implement this RLC understanding, check some or all RLC PDU header and/or PLC payload to allow the B node.
Above-mentioned identification technology relates to via the wave point between wireless network and the user equipment node (UE) transmit data in wireless communication system.When having at least one data flow, UE then sets up communication.The media access control layer that is arranged in wireless network node is from being positioned at the higher wireless chain control layer receiving data units of another node.On media access control layer, analyze some or all header with the Radio Link control data unit of a data stream association, analyze based on this, media access control layer is determined the priority of the data cell relevant with other data cell that is associated with a data flow.The scheduling medium access control layer transmission promptly before the low priority data unit of a related data flow, is transmitted the higher priority data unit with a data stream association.Priority can determine that this header information is not clearly indicated the priority of the data cell relevant with other data cell that is associated with this data flow based on Radio Link control unit header information.
In a unrestricted example was implemented, the specified data unit was control type data cell or data type data cell, and priority is determined based on institute's specified data cell type.In another non-limiting example embodiment, the priority in the re-transmission of the data cell of preceding transmission of a related data flow is classified as the original transmitted that is higher than with the data cell of a data stream association.A unrestricted way of example determining retransmission of data units is, determines the highest sequence number in a plurality of data cells with a data stream association, based on the highest sequence number of determining, determines which unit retransmissions in other all multiple data unit then.
Preferably be stored in the memory of media access control layer with the data cell of a data stream association, so that before the low priority data unit, the higher priority data unit that visit is used to transmit.In a unrestricted example is implemented, from memory, take out the packet of duplicating, postpone and increase efficient to reduce.If desired, can in specified data unit priority, analyze and use the payload information of Radio Link control data unit.For example, if in first data cell of a related data flow, poll bits is set, then with data stream association second data unit header in poll bits can be set to initialization inquiry early, wherein the priority of second data cell is higher than the priority of first data cell.
In a unrestricted example was implemented, wireless network node was the B node in the UMTS type system, and it connects radio network controller.Media access control layer is high-speed downlink shared channel (HS-DSCH) media access control layer of implementing in the B node.An advantage of such scheme is that the priority dedicated signaling that it does not rely on from RNC to the B node is carried out the data cell Determination of priority.Like this, do not need to revise RNC, with insertion priority type information in data unit header, or sending to the B node based on the obvious formula priority of controlling signaling.By making B node " RLC understanding ", the B node can be made priority according to existing information among the RLC PDU and be determined.
Description of drawings
Fig. 1 has shown the UMTS type system of square frame form;
Fig. 2 has shown 3 protocol layers that use in UMTS system shown in Figure 1;
Fig. 3 is applied to shown in Fig. 1 the protocol layer schematic diagram of specific node in the system to specific protocol;
Fig. 4 is the block diagram of affirmation mode RLC entity among the RNC;
Fig. 5 has shown the PDU of Radio Link control and the different-format and the media access control protocol layer of grouping;
Fig. 6 has shown affirmation mode Radio Link control Packet Data Unit header;
Fig. 7 has shown affirmation mode Radio Link state of a control Packet Data Unit;
Fig. 8 has shown the example procedure that is used for " RLC knows " B node PDU scheduling;
Fig. 9 has shown the unrestricted example enforcement at the B node scheduling that is used for high speed descending sharing channel;
Figure 10 has shown the additional figure that receives the various media access control layer entities of high speed descending sharing channel transmission at UE.
Embodiment
Following declarative description specific detail, such as particular implementation, process, technology etc., its objective is and explain rather than limit.Those skilled in the art will appreciate that the part that can utilize these specific detail carries out other enforcement.For example, although utilize unrestricted UMTS example to carry out following explanation, also can in any mobile radio communication of supporting data service, use the present invention.In some instances, the specific descriptions of known method, interface, circuit and signaling are omitted, so that do not obscure explanation because of unnecessary details.In addition, shown each square frame in the accompanying drawing.Those skilled in the art will be appreciated that, the function of these square frames can realize in the following manner: use hardware circuit separately, use software program and data with suitable program numbers microprocessor or all-purpose computer, use special circuit (ASIC), and/or use one or more digital signal processors (DSP).
The basis that is established as with UMTS system shown in Figure 1 and Fig. 2 and RLC, MAC shown in Figure 3 and physical layer protocol, Fig. 4 has shown the model of affirmation pattern (AM) entity 250 that is included in the radio network controller (RNC), and it focuses on transmitting the emitting side of the AM/RLC entity of RLC Packet Data Unit (PDU).Word in Fig. 4 linguistic context " emission " comprises to low protocol layer to be submitted to.AM RLC entity 250 is configured to use a logic channel to send or receives PDU (although can use more than one logic channel).RLC entity 250 receives RLC Service Data Unit (SDU) via AM Service Access point (SAP) from higher protocol level.RLC SDU is by affirmation mode data (AMD) PDU of segmentation and/or 252 one-tenth regular lengths of cascade.If the RLC SDU that receives then carries out segmentation greater than the length of free space among the AMD PDU.
After segmentation/cascade 252, add RLC header 254, in retransmission buffer, place RLC PDU 256, and provide it to multiplexer 258.The RLC PDU of buffer memory is deleted in the retransmission buffer 256, perhaps according to comprising from receiver side and finally from the status report of the status PDU of UE, or the lift-launch status PDU that sends of RLC entity at the same level, retransmits the RLC PDU of institute's buffer memory.Status report can comprise the affirmation and negation of each RLC PDU and confirm.The multiplexer 258 multiplexed RLC PDU that need re-transmission from buffer 256, and regenerate the RLC PDU that additional RLC header unit 254 is transmitted.The output of multiplexer is provided for transmission buffer device 260, thus buffer PDU is passed to the functional block of finishing PDU RLCPDU header, and poll bits for example is set, and may substitute filling (referring to unit 262) with carrying state information.If desired, unit 266 also receive from RLC control unit 274 (for example, reset and reset confirm PDU) with from receiving the control PDU that 268 (for example carrying state and status PDU) receive and data PDU is multiplexing is in the same place.Optional encryption can appear in the unit 262.RLC PDU sends low MAC layer to via Dedicated Control Channel (DCCH) and Dedicated Traffic Channel (DTCH).
At the receiver side of RLC entity 250, demodulation multiplexer/routing unit 264 is from logic channel reception data and the control PDU of low protocol layer via configuration.If used encryption, data PDU is routed to decrypting device 266, and it is passed to session buffer 268.These PDU are stored in the buffer 268, are received until complete RLC SDU.Receiver is confirmed successful reception, perhaps sends one or more status PDU by the transmission side to shown in Figure 4 it, asks the re-transmission of obliterated data PDU.If in PDU, find to carry status PDU, then it is delivered in the retransmission buffer 256 that transmits on the side, so that in buffer 256, remove the PDU of positive acknowledgement, and indicate which PDU to need transmission.In case receive complete RLCSDU, just in unit 272, delete the RLC header and extract lift-launch information, naming a person for a particular job by the AMD PDU of module units 272 assembling associations and via the AM service access then, it passes to higher protocol level.Reset and reset and confirm that PDU is delivered to RLC control unit 374 and handles.Accepting state PDU is delivered to retransmission buffer 256, need be retransmitted so that remove positive acknowledgement AMD PDU and which AMD PDU of indication of buffer.The more detailed content of rlc layer can find in the technical specification 3GPP TS25.322 of third generation partnership plan " radio link control standard ".
Fig. 5 shows in order to transmit on HS-DSCH, by the data encapsulation of B node execution.In W-CDMA, provide the data that will on down link, transmit by rlc layer by rlc protocol data cell (RLC PDU), each RLC PDU comprises sequence number (SN) and data.The MAC-d sublayer receives and is used for the RLC PDU of one or more logic channels, and is that each RLC PDU inserts (C/T) field, to form corresponding M AC-d PDU.The logic channel that the C/T field identification is related with RLC PDU.
The MAC-hs sublayer receives MAC-d PDU and forms MAC-hs PDU.Each MAC-d stream can comprise the data that are used for the one or more logic channels on the rlc layer, and can be associated with certain priority.Because data based priority and available resources transmit, so storage has the data flow of different priorities in the different data streams priority query in the MAC-hs sublayer.After this, when when needing and for the transmission on the HS-DSCH, further handling, retrieve data from suitable priority query.
In order to form MAC-hs PDU, the MAC-hs sublayer at first receives and the continuous one or more MAC-d PDU of cascade from specific data stream priority query, to form the payload of MAC-hs PDU.When needing, add filling bit, to be full of payload.The MAC-hs sublayer is added the header with payload subsequently, to form MAC-hs PDU.
The MAC-hs header comprises that (1) represent the size index ID of the length of each MAC-d PDU among the MAC-hs PDU (SID) field, (2) represent the N field of the quantity of the MAC-dPDU that comprises among the MAC-hs PDU, (3) distribute and be used for identifying uniquely the transmission sequence number (SN) of MAC-hs PDU, (4) represent formation ID (QID) field of particular priority queue, heavily find the MAC-d PDU that comprises the MAC-hs PDU from this formation.The MAC-hs PDU that SN allows the UE sign to recover, and be used to provide MAC-dPDU in regular turn to the RLC sublayer, expect with correct sequence to this sublayer Data transmission.MAC-hs PDU can aloft generate as required.Each MAC-hs PDU transmits by 2 milliseconds of Transmission Time Intervals (TTI), and 2 milliseconds of TTI are the units of transfer on the HS-DSCH.
Control information transmits simultaneously with each transmitted in packets on shared HS-SCCH.This control information comprises that (1) HARQ handles ID (HID), (2) new data indicator, the information of (3) sign control information and the predetermined particular UE that reaches of respective data transfer, (4) out of Memory.The specific HARQ that the HID indication is used to divide into groups is handled.Each grouping can be transmitted and may retransmit one or many, receives the ACK feedback on the HS-DPCCH that (1) UTRAN is being used to divide into groups, and perhaps transmitted in packets is abandoned in the decision of (2) transmitter.Each grouping is handled with specific HARQ and is associated, and this processing is to be used for controlling the example that stops and waiting for (SAW) agreement that the transmission/retransmission of grouping is controlled.Owing to, all be co-pending perhaps therefore at any given instant up to 8 transmission packets for three bits of HID definition.Therefore, 8 HARQ handle and can be regarded as 8 " HARQ channels " that can be used to transmit grouping, and each HARQ channel is associated with a specific HID value, and by this particular value sign.
Fig. 6 has shown AM RLC PDU form.Data/control (D/C) field indication RLCPDU is acknowledged mode data (AMD) PDU (data PDU), still controls PDU.For the control PDU form that shows among Fig. 7, PDU type-word section indication PDU is STATUS PDU, RESET PDU or RESET ACK is PDU.
Now " RLC understanding " B node scheduling flow process among Fig. 8 is described.The B node receives RLC PDU from RNC.Usually, the B node is not checked from the content of any data cell of higher protocol level such as rlc layer reception.But RLC understanding B node is checked all or part of (the step S1) of RLC PDU header.The B node can also be checked the partial content or the full content of RLC PDU payload, and this depends on the application and the type of the priority decision that expection is made.Determine that at step S2 RLC PDU is data type PDU or control type PDU.For control PDU, determine the particular type (step S3) of control PDU, and will control PDU according to determined type and list preferentially (step S4) in.For example, can give the priority that all status PDU are higher than data PDU and improve the upstream data service performance.Data PDU with poll bits that " 1 " is set also can surpass the priority of other data PDU.For data PDU, determine that it is to retransmit PDU or original transmission PDU (step S5).Although any technology can be used for determining whether to transmit PDU, an example, promptly unrestricted technology is made this according to the sequence number of PDU and is determined.The highest Receive sequence number is stored, and all PDU that have than low sequence number think and will be retransmitted.When making this decision, should consider the mould character of sequence number.Retransmit PDU and be given the priority (step S6) that is higher than original transmission PDU.The B node was dispatched the data flow transmission (step S7) of higher priority PDU before the data flow of lower priority PDU.
For specific data stream, be positioned at the PDU that the PDU transmission before with lower priority has high priority, cause postponing of high priority PDU than harmonic(-)mean.Particularly, reduced background technology and used described various delays for this priority scheduling, and improved the performance of transfer of data with the PDU of a data stream association.Reduce the two-way time of selecting RLC PDU with data stream association, can improve and postpone and the performance of throughput aspect.Advantageously, this scheme does not rely on the explicit signaling from RNC to the B node, and can implement with current 3GPP standard.
If the B node except analyzing the RLC header, is also analyzed the payload content of RLC signal, then it can be carried out other performance and comes enhancement function.For example, if identical RLC PDU in buffer, occur once more than (for example, owing to RLC rank retransmit), then the B node is eliminated the PDU that duplicates, and only transmits first example of PDU.In addition, if poll bits is set among the RLC PDU of buffer, then the B node can be revised the header of the 2nd RLC PDU that before had been arranged in data flow buffer, and change into poll bits is arranged among the 2nd RLCPDU, if (and wish, then from a PDU, eliminate poll bits), thus the time that in UE, receives before inquiring about reduced.
Fig. 9 is the schematic diagram of MAC-hs entity 224, and this entity handles HS-DSCH goes up data that transmit and the physical source distributing of managing HSDPA.UTRAN MAC-hs entity comprises: scheduling/processed entity 410, HARQ entity 420 and TFRC select entity 430.The suitable data format of transfering and the resource of the data that 430 selections of TFRC entity will be transmitted on HS-DSCH.Scheduling/processed entity 410 is identified for the MAC PDU data flow priority queue 414 that each is being handled according to the data flow of priority management from the MAC-d entity, and the transmission/retransmission of definite PDU.B node scheduling device 410 also comprises RLC analyzer and PDU scheduler 416, is used to handle the PDU from each stream of flow priority formation 414.RLC analyzer and PDU scheduler 416 comprise PDU buffer 418, and storage higher priority PDU makes it than the more Zao transmission of lower priority PDU in this buffer.RLC analyzer and PDU scheduler 416 are used for the processing of data flow priority except normal execution the in scheduler 410, also carry out additional priority analysis.As an example, it can be according to the analysis of RLC PDU header, and if desired, according to the analysis of RLC PDU payload, implements the described process of Fig. 8.HARQ 420 entities are set to each UE and handle the HARQ function.Transmission and (if desired) that the HARQ entity is carried out grouping retransmit, and are grouped into the reliable delivery of UE so that guarantee these.Carry out packet retransmissions present according to ACK/NAK feedback from UE.
Figure 10 is the schematic diagram of the MAC-hs entity 224 of UE side.MAC-hs entity 224 is handled the HSDPA specific functions, and comprises: one group of rearrangement buffer 462, the rearrangement entity 464 of HARQ entity 440, rearrangement queue distribution entity 450 and each formation ID of being used for disposing on UE are conciliate assembling entities 466.A rearrangement buffer 462 so is provided with, and is associated with each priority query that is used for UE.UE HARQ entity 440 is handled the required All Jobs of HARQ (for example, generation is used for the required ACK/NAK that each has received transmitted in packets).The rearrangement queue distribution entity provides the grouping that has recovered according to the formation ID that sends for grouping to suitable rearrangement buffer.Be used for of the recovery grouping of the rearrangement entity of each rearrangement buffer according to the SN rearrangement buffer of distributing to each grouping.The sequence of each priority query and SN oneself is associated.The rearrangement entity offers the grouping with continuous SN and separates the assembling entity subsequently after recovering grouping.Lose if having the grouping of low SN, then grouping is not delivered to and separates assembling entity (that is, " stall ").The separate assembling entity related with each rearrangement buffer decomposes grouping by the header in each grouping of elimination, so that obtain the MAC-hs payload, extraction comprises the MAC-d PDU of MAC-hs payload, and abandons filling bit (if any).Separate the assembling entity and provide MAC-d PDU via the MAC-d sublayer to higher level subsequently.
Although with most preferred embodiment the present invention has been described in conjunction with thinking most realistic at present, but be to be understood that and the invention is not restricted to the disclosed embodiments, but opposite, the present invention plans to cover various modifications included within the claims scope and is equal to arrangement.
Claims (28)
1, a kind of via the wave point method of transferring data in wireless communication system between wireless network and the user equipment node (UE), comprise set up have at least one data flow with the communicating by letter of UE, step with receiving on media access control layer from the data cell of higher wireless chain control layer the method is characterized in that further comprising the steps of:
The Radio Link control data unit header of an analysis and a described data stream association is part or all of on media access control layer;
According to analysis, on media access control layer, determine the priority of the data cell relevant with other data cell of a related described data flow;
Scheduled transmission on media access control layer, with the low priority data unit of a described data stream association before, the higher priority data unit of transmission and a described data stream association.
2, method according to claim 1, wherein analytical procedure comprises, according to the Radio Link control data unit header information of not explicit designation data unit priority, determines priority.
3, method according to claim 1, wherein determining step also comprises:
The specified data unit is control type data cell or data type data cell;
Determine priority according to determined data cell type.
4, method according to claim 1, wherein determining step also comprises:
Classifying the original transmitted that is higher than with the data cell of a described data stream association as with the priority in the re-transmission of the data cell of preceding transmission of a described data stream association.
5, method according to claim 1, wherein determining step also comprises:
The sequence number of specified data unit;
Determine priority according to determined sequence number.
6, method according to claim 5, wherein determining step also comprises:
Determine highest sequence number with a plurality of data cells of a described data stream association;
According to determined highest sequence number, determine that in other data cell with a described data stream association which is retransmitted.
7, method according to claim 6, wherein determining step also comprises:
When determining which data unit retransmission, consider the mode sequence numbering.
8, method according to claim 2, wherein determining step also comprises:
Determine the type of control data unit;
Determine priority according to determined control data cell type.
9, method according to claim 2 also comprises:
The data cell of a related described data flow is deposited in the memory of media access control layer,, be transmission visit higher priority data unit so that before the low priority data unit.
10, method according to claim 9 also comprises:
From memory, eliminate duplicate data packets.
11, method according to claim 9, wherein analysis also comprises:
Information in the payload part of analysis Radio Link control data unit.
12, method according to claim 11, wherein determining step also comprises:
If with first data cell of a described data stream association in poll bits is set, then with the header of second data cell of a described data stream association in poll bits is set, described second data cell has the priority that is higher than first data cell.
13, method according to claim 1, wherein wireless network comprises the B node that is connected for radio network controller (RNC) communication, and wherein higher radio link layer is Radio Link control (RLC) layer of implementing in RNC, and media access control layer is high speed descending sharing channel (HS-DSCH) media access control layer of implementing in the B node.
14, method according to claim 13, wherein this method does not rely on the priority dedicated signaling from RNC to the B node when carrying out determining step.
15, the node in a kind of wireless network, be used for promoting and the communicating by letter of user equipment node (UE), this communication comprises at least one data flow via wave point, wherein said node comprises the media access controller of the more senior Radio Link Controller receiving data units from be included in radio network controller (RNC), it is characterized in that described media access controller also comprises:
Analytical equipment, be used to analyze with the Radio Link control data unit header of a described data stream association partly or entirely;
Determine device, according to analyzing the priority of determining a data unit relevant with other data cell of a related described data flow;
Dispatching device, with the low priority data unit of a data stream association before, the transmission of scheduling and the higher priority data unit of a described data stream association.
16, node according to claim 15, wherein analytical equipment comprises definite priority device, is used for the header information according to the Radio Link control data unit of non-explicit designation data unit priority, determines priority.
17, node according to claim 15, determine that wherein device is configured to:
The specified data unit is control type data cell or data type data cell;
Determine priority according to determined data cell type.
18, node according to claim 15, determine that wherein device is configured to:
Classifying the original transmitted that is higher than with the data cell of a described data stream association as with the re-transmission priority in the data cell of preceding transmission of a data stream association.
19, node according to claim 15, determine that wherein device is configured to:
The sequence number of specified data unit;
Determine priority according to determined sequence number.
20, node according to claim 19, determine that wherein device is configured to:
Determine highest sequence number with a plurality of data cells of described data stream association;
According to determined highest sequence number, determine which re-transmission in other data cell with a data stream association.
21, node according to claim 20, determine that wherein device is configured to:
In determining which data unit retransmission, consider the mode sequence numbering.
22, node according to claim 16, wherein for the control type data cell, determine that device is configured to:
Determine the type of control data unit;
Determine priority according to determined control data cell type.
23, node according to claim 16 also comprises:
Storage device is used for the data cell of a related described data flow is stored in media access control layer, so that before the low priority data unit, is transmission visit higher priority data unit.
24, node according to claim 23, wherein analytical equipment is configured to:
Information in the payload part of analysis Radio Link control data unit.
25, node according to claim 24, determine that wherein device is configured to:
Determine with first data cell of data stream association in whether be provided with poll bits,
If, then with the header of second data cell of described data stream association in poll bits is set, described second data cell has the priority that is higher than first data cell.
26, node according to claim 15, wherein said node are the B nodes, and media access control layer is high speed descending sharing channel (HS-DSCH) media access control layer of implementing in the B node.
27, node according to claim 26, wherein analytical equipment and definite device do not rely on the priority dedicated signaling from RNC to the B node.
28, a kind of mobile radio communications system comprises the described node of claim 15.
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| SE0302685A SE0302685D0 (en) | 2003-10-07 | 2003-10-07 | Method and arrangement in a telecommunication system |
| PCT/SE2004/001438 WO2005034418A1 (en) | 2003-10-07 | 2004-10-07 | Medium access control priority-based scheduling for data units in a data flow |
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| US (1) | US8259732B2 (en) |
| EP (1) | EP1673895B1 (en) |
| CN (1) | CN1864363B (en) |
| HK (1) | HK1098610A1 (en) |
| SE (1) | SE0302685D0 (en) |
| WO (1) | WO2005034418A1 (en) |
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| WO2019015487A1 (en) * | 2017-07-17 | 2019-01-24 | 中国移动通信有限公司研究院 | Data retransmission method, rlc entity and mac entity |
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| US8259732B2 (en) | 2012-09-04 |
| CN1864363B (en) | 2010-05-12 |
| WO2005034418A1 (en) | 2005-04-14 |
| EP1673895B1 (en) | 2012-12-05 |
| HK1098610A1 (en) | 2007-07-20 |
| EP1673895A1 (en) | 2006-06-28 |
| SE0302685D0 (en) | 2003-10-07 |
| US20070081513A1 (en) | 2007-04-12 |
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